* A hydroponic shelf is a type of gardening setup that uses a shelving system to grow plants in a nutrient-rich solution, rather than in soil.
* The plants are placed in containers filled with a growing medium, such as clay pellets or rockwool, and the roots are suspended in a solution of water and nutrients.
* This method of gardening allows for the efficient use of space, as multiple plants can be grown in a small area, and can also result in faster growth and larger yields.